Here is a recording from 1971 of the Spanish language voice announcement given by time station LOL in Buenos Aires, Argentina.  If memory serves, this was typically preceded by a few "LOL" ID's in morse code.  However, on this recording, you will only hear "Observatorio Naval Argentina", then "veinte horas" (local time in Buenos Aires) before the announcement by WWV in Fort Collins, Colorado (operating on the same frequency of 15 MHz) begins.  A Hallicrafters S-52 receiver was being used hooked up to a long wire antenna.

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